$1B is life changing money. More than you can reasonably spend, unless you start an airline or something like that. $1m is like two Ferraris. If you buy the second one used. Of course it's also life-changing amounts of money to many. It's enough to retire in a cheap country. But only if you are very careful about your money

There are a lot of projects I would sell for $1m, but it is little enough that I would carefully consider for anything I've invested serious time into